How to proceed:
- Disassemble both shifter units.
- Disconnect all the wires from the circuit board, do it carefully.
- remove the bottom piece of the G27 shifter, don't touch the mechanical part, remove only the black wire coming out of the G27 (the one goes on wheel base).
- Open the G25 shifter, remove the metal plate that goes under the knob to change shifting modes. Be careful as the sliding mechanism under it will want to pop up and the springs will come out. So hold that thing down and be ready to take that out (its two sliding pieces overlapping, hold them together when you take it out). You'll also need that switch.
- Remove the G25 black cable as you did for the G27 shifter.

Time to put it back:
- Install those three parts (switch, then sliding mechanism, then the plate) into the G27 base.
- mount the G25's cord and the G25 board and swap them into the G27 base.
- Finally take the top half of the G25 and put it onto the G27 base after making all the connections, please don't forget the knob switch wires!!!

#26 | HSRC - Banzaaaiii Touring Car CrewPremium Member

Hmmm... So why all this? I might have not caught the purpose, but you could easily use the G25 shifter as it is and just bring it to a better feel with some spring and preload mods. Which is kinda what you did by taking the mechanical parts from the G27 shifter.

Premium Member

I am not sure about it, I used a G25 shifter with mechanical parts from a G27 one with a G27 wheel and they work well...
If you swap the black cable (the one goes from shifter to wheel) G25>G27 maybe it will work but I not sure so if you try...you are doing it at your risk...

#26 | HSRC - Banzaaaiii Touring Car CrewPremium Member

Premium Member

The wiring is not the same. You can either buy an adapter or solder one for yourself if you have the skills.

Click to expand...

If you swap them you don't need adapters or soldering...
In my mod I have a G25 shifter board working with a G27 wheel board, to avoid soldering or adapters I put the G27 shifter cable to G25 shifter board...I think he can do the trick too...